Why do some catch tanks have a breather on the top and others don’t, Never really got it? Besides a 1ltr coke bottle, what do most people run on there mini's, one that vents to atmosphere or one that does not.

How is the piping organised? (rocker cover, rear tapit case and flywheel housing, maybe crank case, straght into catch?) Assuming its for a NA engine.

_________________

*Reasonable pricing
*I come to you..
Jay: 0431404607

If your catch tank has no breather, it is useless. You will just build up crankcase pressure and blow seals and drip oilz.

Vent hole area should at least equal cross sectional area of the hose(s) going to it.

I run a 1/2" hose from the flywheel housing breather, and another from rocker cover.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

hey it has to be a 2 litre coke bottle according to the CAMS manual

the catch can should be vented to atmosphere so you don't pressurise the crank case. if it has no holes in the top (must be the top ) then there should be a gap around where the hose goes in to allow it to vent. if you clamp the hose into the coke bottle with a good seal, all you have done is make a nice little balloon that WILL blow up eventually.

cheers
michael

_________________
the world is a book, and those who do not travel read only a page
66 Mini Minor sponsored by http://www.lifeonthehedge.com.au/ The Dog Harness Specialists
It was a pleasure ausmini. I'll miss all you misfits and reprobates

I have currently been running a cotties bottle (all vented to atmosphere), But thought I should make up something decent, looked on eBay, but its all junk, most don’t have vents and all have only 2 entrees.
Must all oil exits enter the catch? Should any be plumed back into the engine via PCV valve etc? If so whats your sudgestions.
This advice is for a Race car, if that makes the Diff.

_________________

*Reasonable pricing
*I come to you..
Jay: 0431404607

When I was using one for my old car, I used one of the old old school castrol 1 liter oil tins. They were steel with rolled edges and galvinised all over. They looked quite good with the fittings soldered on - very period.

_________________
SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

I run a PCV on the road, but for track days I bung the catch tank on.
You can't run both, it won't work properly.

Reason I remove the PCV for track use at Wakefield is it sucks oil from the primary gear area on long LH bends at high RPM. Makes like JB007....
Note it's a 1300 auto block, NOT an S... so no S tappet chest breather.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

So DOC, keep the pluming how i have it, (crank case breather and rocker cover) into catch tank that is vented to atmosphere (what size OB on the breather of the catch), mix this up with a non-vented cap and nothing on the manifold?. Now the question is two breathers substantial?

_________________

*Reasonable pricing
*I come to you..
Jay: 0431404607

2 breathers was fine on my 1310 at up to 8000 rpm, no oil came from dipstick or elsewhere.
You could add another one to the timing cover, but there's not much room there in a roundnose.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

A 2.0 litre plastic oil comtainer with vent holes drilled in the lid and handle. Into it goes a 1" diameter breather pipe from the rocker cover and a 1/2" breather pipe from the front side cover.
Very simple and effective.

_________________
Curly
'64 Cooper 'S' (Group Nb spec)
'67 Mini Marcos GT www.mm7056.wordpress.com

Thanks for your help... Mine is setup similar to yours, except i have it vented from the crank case (flywheel housing) instead of the rear tappet cover. Just wanted something more easy on the eyes that my current setup and wanted to insure my setup is correct.

Thanks again.

_________________

*Reasonable pricing
*I come to you..
Jay: 0431404607

Dont see a probelem with a coke bottle but I understand where you are comming from..You could always get pne of those from Flebay and modifey it so it work properly...
I use a coke bottle at the moment which is plumed (sometime's when it does not come off) from the top of the rocker cover via a side hole and the lid is off./ you can make it as fance as you want but it only catch's oil that is blown back via these ports when something is not rite or in the extreams.
I must say I will have a bling one not like the daily drive has

_________________
Stop Licking the Dog...I Don't Care Who Started It